--- a/CookBook/Appendix.thy	Sun Mar 08 20:53:00 2009 +0000
+++ b/CookBook/Appendix.thy	Tue Mar 10 13:20:46 2009 +0000
@@ -18,6 +18,12 @@
   user space type systems (in the form that already exists)
 
   unification and typing algorithms
+
+  useful datastructures:
+
+  discrimination nets
+
+  association lists
 *}
 
 end